Malicious PDF — malware analysis report

Static analysis result for SHA-256 aacea413e66f5fd1…

MALICIOUS

PDF

90.9 KB Created: 2021-04-07 03:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0694d60bb153cf563e9269d32cc45f3e SHA-1: 050b2ca990402f80a3bca2ebdf29ac2080ebd4e6 SHA-256: aacea413e66f5fd1b6917488099c6726987619a581393ff21252d2d3097e5ab7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a prominent one pointing to 'kuzutuzo.ru' disguised as a credit card closure form. The document body, though heavily obfuscated, suggests a lure related to financial documents, reinforcing the phishing pretext. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing attempt designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/award?keyword=hdfc+credit+card+closure+form+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490367/normal_604e1f0b3828c.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/6795346.pdfIn PDF document text
    • https://pivifezimar.weebly.com/uploads/1/3/4/7/134719334/zawakusibijotabovoxu.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/ratelalajuteterujudimo.pdfIn PDF document text
    • https://fomememuvur.weebly.com/uploads/1/3/4/0/134000402/9193339.pdfIn PDF document text
    • http://gratoramm.website/wolfgang_puck_rice_cooker_recipes_macaroni_cheeselsfku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460045/normal_60434e5df1b6d.pdfIn PDF document text
    • http://brumbum3.xyz/comparing_constitutional_convention_plans_worksheet_answerswj8ng.pdfIn PDF document text
    • http://axecheat5.xyz/vefixuwojakrp6.pdfIn PDF document text
    • https://vawuwoteb.weebly.com/uploads/1/3/0/9/130969488/6687658.pdfIn PDF document text
    • https://cdn.sqhk.co/kujusiru/yjbZcja/xagon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_602b3ca2c60d3.pdfIn PDF document text
    • http://save50it.pro/firebreather_cartoon_network_full_movielmfzo.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/xuzor.pdfIn PDF document text
    • http://bigmagazin.xyz/best_free_video_call_softwarera8qv.pdfIn PDF document text
    • http://zomixuxoluzijum.mywebcommunity.org/tifexolixijibedarenise.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/vUjixid/fesufaruxavure.pdfIn PDF document text
    • http://hytri.com/chasing_cars_320kbpsz663l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_602de1db305ed.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/vipamewid.pdfIn PDF document text
    • http://imedo.ru/317788367861ajth.pdfIn PDF document text
    • http://copyright-rules-help.com/95813182895ue4t0.pdfIn PDF document text
    • http://itclick.info/the_apostrophe_practice_2_answersf7ymb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuxalonitu.onlinewebshop.net/92018554360.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 13268 bytes
SHA-256: 2752993a775614d221a661c058dad987b47b14656ed8364272baa1779dd85c49
font_01_sfnt_off00012345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 5260 bytes
SHA-256: a05a4f81289c795285a89e2ce1c3ea7533dbc4e67c28db903671b4ce849444fc
font_02_sfnt_off00013511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13511 11388 bytes
SHA-256: 330c5703da9816105372a31436b1a352d557918bfaab5bcc181c36661937d8b5

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